How should we teach the events of 9/11 to small children? Wayne Bell,
the publisher of Really Big Coloring Books Inc. has an answer:

A "graphic coloring novel" called We Shall Never Forget
9/11: The Kids' Book of Freedom. The 36-page coloring book depicts the
Twin Towers smoldering, survivors mourning the tragedy's victims, and
a Navy SEAL shooting Osama bin Laden, who is (inaccurately) cowering
behind a woman in a Muslim hijab. (See the image below.) Bell nevertheless
claims it's "a very clean, honest read that does not shy away from
the facts" about 9/11.

What do you think? Is it appropriate? Should 9/11 be memorialized in
crayons? Link

This level of violence is not subject material for children. Their minds cannot properly process this kind of violence, and nor should they. There is plenty amount of time for them to understand what really happened. You are only an innocent kid once.

It's up to each parent how they want to broach this topic with their child, because how each family was effected is going to differ greatly.

That said. This is NOT a subject for a coloring book. Coloring books, are supposed to help with motor functions, and be a bright happy learning experience. To take away a childs Cars, or Tangled Coloring book, and to replace it with scenes of grief, violence, and politics, and present it as a fun, creative and artistic activity, falls into the land of desensitizing and brainwashing, and taking away some of the safety/security you are supposed to feel as a child, so you can grow up and be a well adjusted adult.

I'm sure this guy developed this book as a sensationalistic piece, to make money, and stir controversy, but for the parents who think it is a GOOD idea, you trouble me.